Model 231 Multi-Sense Wet-to-Wet Pressure Transducer Pressure Transducer 978-263-1400; 800-257-3872 ... Setra Systems 231 pressure transducers sense differential pressure and convert

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    Model 231 Multi-SenseWet-to-Wet Pressure Transducer

    978-263-1400; 800-257-3872www.setra.com; sales@setra.com

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    Contents1.0 GENERAL INFORMATION ...................................................................... 4

    2.0 MECHANICAL INSTALLATION ............................................................. 4

    2.1 Media compatibility ........................................................................ 4

    2.2 Environment ...................................................................................... 4

    2.3 Pressure Fittings ............................................................................... 5

    2.4 Mounting ............................................................................................ 5

    2.5 Installation Procedures .................................................................. 5

    3.0 OPTIONAL 3-VALVE MANIFOLD PROCEDURE ............................... 6

    4.0 ELECTRICAL INSTALLATION ................................................................. 8

    4.1 Electrical Termination

    Wiring: 2-Wire , 4 to 20 mA and Remote Zero ............................. 8

    4.2 Electrical Termination

    Wiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero ........ 9

    5.0 OPERATION.............................................................................................. 10

    6.0 RETURNING PRODUCTS FOR REPAIR .............................................. 11

    7.0 WARRANTY AND LIMITATION OF LIABILITY ................................. 11

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    Installation GuideMulti-Sense Model 231 Series

    Wet-to-Wet Differential Pressure Transducers

    1.0 GENERAL INFORMATIONEvery Model 231 has been calibrated and tested before shipment to guaranteeperformance of all pressure ranges.

    The Model 231 has field selectable unidirectional and bidirectional pressureranges, configurable 0 to 5 VDC, 0 to 10 VDC , and 1 to 5 VDC output, truetwo-wire 4 to 20 mA output, and auto-zero capability. The Model 231 is factorycalibrated to the highest pressure range. The range label on the side of the unitindicates the factory calibrated range.

    Setra Systems 231 pressure transducers sense differential pressure and convertthis difference in pressure to a proportional high level analog output for unidirec-tional and bidirectional pressure ranges.

    Your Model 231 Multi-Sense pressure transducer has been ordered in one of thefollowing versions:

    2.0 MECHANICAL INSTALLATION2.1 Media compatibilityModel 231 transducers are designed to be used with any gas or liquid compat-ible with 17-4 PH stainless steel, The optional 3-valve manifold assembly isdesigned to be used with gases or liquids compatible with 360 Brass, Acetal plugvalves and Nitrile O-Rings. Never totally submerge the unit in any liquid.

    2.2 EnvironmentThe operating temperature limits of the 231 are as follows:

    Compensated Temperature Range F (C) +32 to +130 (0 to +54)Operating Temperature Range F (C) -4 to +185 (-20 to +85)Storage Temperature Range F (C) -4 to +185 (-20 to +85)

    Version Unidirectional BidirectionalMS1 5, 10, 20, 50 psid 5, 10, 20, 50 psidMS2 10, 20, 50, 100 psid 10, 20, 50, 100 psidMS3 25, 50, 125, 250 psid 25, 50, 125, 250 psid

    Model 231

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    2.3 Pressure FittingsTypically standard pipe fittings and installation procedures should be used.

    The Model 231 has 1/8 NPTF internal fittings. The high pressure port and lowpressure port are located on the bottom of the unit , labeled HI and LO, respec-tively. The optional 3-valve manifold assembly is supplied with 1/418 NPTinternal fittings.

    Moisture PrecautionsThe Model 231 is provided with a 0.875 DIA. conduit opening for electricaltermination, intended for a 1/2 I.D. conduit connection. This opening must besealed according to standard industry practices in order to prevent moistureingress into the Model 231.

    2.4 MountingThe Model 231 can be easily mounted using the two mounting screws locatedon the side of the unit.

    2.5 Installation ProceduresIf the Model 231 is supplied with an optional 3-valve Manifold assembly, refer tosection 3.0, Optional 3-Valve Manifold Assembly Procedure, for further installationprocedures. If the Model 231 is not supplied with a Setra 3-Valve manifold, thefollowing installation procedure is recommended.

    For differential pressure measurements at high line pressure, it is recommendedthat the pressure sensor be installed with a valve in each line, plus a shunt valveacross the high and low (reference) pressure ports as shown.

    Important: Do not exceed maximum range pressure with the total ofdifferential pressure and line pressure.

    Valve 1 = High Side ValveValve B = Low Side ValveValve C = Shunt Valve

    High

    Valve A Valve B

    Valve C

    Low

    High Low

    DifferentialPressure Sensor

    Figure 1

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    3-Valve Manifold DescriptionManifold Block BrassValves (3) V1 for connection to + port

    V2 for connection to - portV3 for equalizing pressure

    Valve Type 90 degree On/OffProcess Connections 1/4-18NPT Internal Thread

    Model 231DifferentialPressure Transducer

    Shunt Valve

    V1 V2

    V3

    Shut Off Valves

    High ProcessConnection1/8-NPT

    Low ProcessConnection1/8-NPT

    3.0 OPTIONAL 3-VALVE MANIFOLD PROCEDURE

    The 3-Valve Manifold Assembly is normally shipped with valves V1 and V2 closedand V3 open.

    To Place the 231 into service:1. Confirm valves V1 and V2 are closed and valve V3 is open.2. Mount the manifold and install process connections.3. Slowly open V2, then V1.4. Close the V3 valve.

    To Take the 231 out of Service1. Open V3 to equalize the pressure at the Model 231.2. Close the V1 and V2 valves.

    Figure 2

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    1/2 Conduit Opening

    Model 231 - Outline Drawing

    in.mm

    Front View

    Bottom View

    Side View

    Figure 3

    5.6141

    6.0152

    0.39

    R 0.12

    1.231

    1.742

    1.024

    1.640

    5.2131 1/8 NPTF

    2.051

    4.0102

    4.6117

    4.8122

    2.051

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    4.0 ELECTRICAL INSTALLATIONTo access the electrical connections, turn the screws on the top of the casecounter clockwise until the hinged cover can be flipped up. The screws arecaptured and secured in the cover. Wiring is through the 1/2 conduit opening.Both current and voltage outputs are reverse wiring protected.

    Note: The Zero terminals, connected to digital output, provide a contact closure relay for automatic reset to zero pressureby the monitoring system. CAUTION: ZERO input is for dry contact, do no apply voltage to ZERO Terminals

    4.1 Electrical TerminationWiring: 2-Wire - 4 to 20 mA (Current Output) and Remote ZeroModel 231 when configured as a current output transducer is a true 2-wire, 4-20 mA current output device and delivers rated current into any externalload of0-1000 ohms.

    When configured as a 4-20 mA current output device the current flow is in onedirection only. PLEASE OBSERVE POLARITY.

    We suggest that an electrical cable shield be connected to the systems loopcircuit ground to improve electrical noise rejection.

    Min. Supply Voltage: 12 + .02 x (Resistance of receiver plus line)Max. Supply Voltage: 30 + .004 x (Resistance of receiver plus line)

    The optional remote zero is a normally open relay wired between COM andREMOTE ZERO terminals. In order to initiate ZERO function the relay contact shallbe closed.

    A B C DMS1 50 25 10 5MS2 100 50 20 10MS3 250 125 50 25

    A B C D

    RANGES

    ZERO

    OUTPUT

    A B C D

    4-20 0-5 0-10 1-5

    A B C DBARA.REVSLOWBI-DIRSWAP

    PSINORMFASTUNI-DIRNORM

    + EXC. COMOUT

    DC Power Supply

    ControllerCurrent

    (4-20 mA)

    +

    Figure 4

    +

    +

    Relay

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    4.2 Electrical TerminationWiring: 3-Wire, 0 to 5, 0 to 10, 1-5 VDC and Remote Zero

    The Model 231 when configured for voltage output is a 3-wire circuit device withthree terminals available for wiring. The -Excitation and -Output are commonedon the circuit.

    The 231 can operate from 12-30 VDC (18-28 VAC) nominal output power supply.

    Note: The Zero terminals, connected to digital output, provide a contact closure relay for automatic reset to zero pressureby the monitoring system. CAUTION: ZERO input is for dry contact, do no apply voltage to ZERO Terminals

    The optional remote zero is a normally open relay wired between COM andREMOTE ZERO terminals. In order to initiate ZERO function the relay contact shallbe closed.

    Figure 5

    A B C DMS1 50 25 10 5MS2 100 50 20 10MS3 250 125 50 25

    A B C D

    RANGES

    ZERO

    OUTPUT

    A B C D

    4-20 0-5 0-10 1-5

    A B C DBARA.REVSLOWBI-DIRSWAP

    PSINORMFASTUNI-DIRNORM

    + -+EXC. COMOUT

    DC/ACPower Supply

    Controller

    +

    +

    Installation of the Model 231 is now complete.

    Important: Prior to putting the unit into service, press the Zero button,then use the Range Selection Switch to select a range. After selecting arange, press the Zero button again. For instructions regarding operationof the Model 231, please refer to Section 5, page 10.

    Voltage

    Relay

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    A B C DMS1 50 25 10 5MS2 100 50 20 10MS3 250 125 50 25

    A B C D

    RANGES

    ZERO

    OUTPUT

    A B C D

    4-20 0-5 0-10 1-5

    A B C DBARA.REVSLOWBI-DIRSWAP

    PSINORMFASTUNI-DIRNORM

    REMOTE ZERO4-20 MA+ -

    + -+EXC. COMOUT

    Electrical Connections

    Range Selection Switch Auto Zero Button Electrical Output Configurator

    5.0 OPERATION

    Range Selection Switch: The unit is set to the highest range when calibrated atthe factory. To select t